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13 Cards in this Set
- Front
- Back
Matter
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Anything that has mass and takes up space.
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Element
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A substance that cannot be separated or broken down into simpler substances by chemical means.
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Atom
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The smallest unit of an element that maintains the chemical properties of that element.
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Molecule
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A group of atoms that are held together by chemical forces; a molecule is the smallest unit of matter that can exist by itself and retain all of a substance's chemical properties.
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Compound
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A substance made up of atoms of two or more different elements joined by chemical bonds.
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Pure Substance
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A sample of matter, either a single element or a single compound, that has definite chemical and physical properties.
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Mixture
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A combination of two or more substances that are not chemically combined.
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Melting Point
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The temperature and pressure at which a solid becomes a liquid.
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Boiling Point
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The temperature and pressure at which a liquid becomes a gas.
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Density
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The ratio of the mass of a substance to the volume of the substance.
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Reactivity
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The capacity of a substance to combine chemically with another substance.
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Physical Change
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A change of matter from one form to another without a change in chemical properties.
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Chemical Change
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A change that occurs when one or more substances change into entirely new substances with different properties.
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